Online Dissolved Gas Analysers (DGA) (Single or Multiple Transformers) Get latest price

The analysis is done in 2 steps with high selectivity and accuracy fully compilable with or better than laboratory procedures.

Vacuum degassing

• A new  vacuum degassing method (Patent pend. DE 102 52 652 4) has been invented which de-gasses the oil sample periodically.
• After extraction through a 4 step vacuum pump the gases are dosed into a vacuum chamber and separated.
• The gases are evacuated from the vacuum chamber with a vacuum pump, therefore a very high sensitivity is achieved.
• The inlet and outlet of the oil sample as well as the switching valve are micro-processor controlled, and feedback of the oil into the transformer is performed.
• A linear pressure sensor measures the total gas content online which is a very important quality parameter relating to the transformer load.
• The injection of the gas sample into the gas chromatograph is via a fixed mounted and heated transfer pipe. An additional port for withdrawal of gas samples is installed.

Dissolved Gas Analysis with Mobil GC

• The analysis of the dissolved gases is performed following automatic injection in an automatic sample loop ( 6 port valve) of the gas chromatograph.
• The gas sample is separated in an inert gas stream into 11 components. This guarantees high selectivity with no interference of gas signals.
• A capillary column ( typ Carboxen 1010, length 30m x ID 0,32 mm) is used for the separation of the different compounds. Detection is carried out with a TCD ( Thermal Conductivity Detector) and FID (Flame Ionization Detector).
• The compounds CO and CO2 are converted with a methanizer for detection on the FID which guarantees very high sensitivity.
• The following gasses are evaluated: H2, CO, CO2, CH4, C2H2, C2H4, C2H6, O, N, C3H6, C3H8

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